Bill Monroe ('Invented' Bluegrass-) 19 guesses
Philo T Farnsworth (Invented TV) - 25 guesses after a wrong guess on Edison.
It was kinda weird - it asked the same questions over again (or is it 'testing' you?). And it asked if the person was alive in the 19th century, Edison was, but Farnsworth wasn't (had to look it up), so did it figure my answer wasn't correct, and goes for the 'best fit'?
Also weird that it doesn't tell you how many it took, I had to hit the back arrow.
-ERD50